<template>
      <div class="app-container">
        <h2 style="text-align: center;">发布新课程</h2>
        <el-steps :active="1" process-status="wait" align-center style="margin-bottom: 40px;">
          <el-step title="填写课程基本信息"/>
          <el-step title="创建课程大纲"/>
          <el-step title="最终发布"/>
        </el-steps>
        <el-form label-width="120px">
  <el-form-item label="课程标题">
    <el-input v-model="courseInfo.title" placeholder=" 示例：机器学习项目课：从基础到搭建项目视频课程。专业名称注意大小写"/>
  </el-form-item>
  <!-- 所属分类 TODO -->
<el-form-item label="课程分类">
  <el-select
    v-model="courseInfo.subjectParentId"
    placeholder="一级分类" @change="subjectLevelOneChanged">
    <el-option
      v-for="subject in subjectOneList"
      :key="subject.id"
      :label="subject.title"
      :value="subject.id"/>
  </el-select>
  <!-- 二级分类 -->
<el-select v-model="courseInfo.subjectId" placeholder="二级分类">
  <el-option
    v-for="subject in subjectTwoList"
    :key="subject.value"
    :label="subject.title"
    :value="subject.id"/>
</el-select>
</el-form-item>
  <!-- 课程讲师 TODO -->
  
<!-- 课程讲师 -->
<el-form-item label="课程讲师">
  <el-select
    v-model="courseInfo.teacherId"
    placeholder="请选择">
    <el-option
      v-for="teacher in teacherList"
      :key="teacher.id"
      :label="teacher.name"
      :value="teacher.id"/>
  </el-select>
</el-form-item>
  <el-form-item label="总课时">
    <el-input-number :min="0" v-model="courseInfo.lessonNum" controls-position="right" placeholder="请填写课程的总课时数"/>
  </el-form-item>
  <!-- 课程简介 TODO -->
  <el-form-item label="课程简介">
    <tinymce :height="300" v-model="courseInfo.description"/>
</el-form-item>
  <!-- 课程封面 TODO -->
<el-form-item label="课程封面">
  <el-upload
    :show-file-list="false"
    :on-success="handleAvatarSuccess"
    :before-upload="beforeAvatarUpload"
    :action="BASE_API+'/eduoss/fileoss'"
    class="avatar-uploader">
    <img :src="courseInfo.cover">
  </el-upload>
</el-form-item>
  <el-form-item label="课程价格">
    <el-input-number :min="0" v-model="courseInfo.price" controls-position="right" placeholder="免费课程请设置为0元"/> 元
  </el-form-item>
  <el-form-item>
    <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存并下一步</el-button>
  </el-form-item>
        </el-form>
      </div>
    </template>
<script>
import course from '@/api/edu/course'
import subject from '@/api/edu/subject'
import Tinymce from '@/components/Tinymce'
export default{
    components: { Tinymce },
    data(){
        return{
            saveBtnDisabled:false,
            courseInfo:{
                title: '',
                subjectId: '',
                subjectParentId:'',
                teacherId: '',
                lessonNum: 0,
                description: '',
                cover: '/static/tu.png',
                price: 0
            },
            courseId:'',
            BASE_API: process.env.BASE_API, // 接口API地址
            teacherList:[],
            subjectOneList:[],
            subjectTwoList:[]
        }
    },
    created(){
      if(this.$route.params && this.$route.params.id){
      this.courseId = this.$route.params.id
      this.getInfo()
      }else{
        this.getListTeacher()
        this.getOneSubject()
      }
    },
    methods:{
        getInfo(){
          course.getCourseInfo(this.courseId)
          .then(response =>{
            this.courseInfo = response.data.courseInfo
          subject.getSubjectList()
          .then(response =>{
            this.subjectOneList = response.data.list
            for(var i=0;i<this.subjectOneList.length;i++){
              var oneSubject = this.subjectOneList[i]
              if(this.courseInfo.subjectParentId === oneSubject.id){
               this.subjectTwoList = oneSubject.children
              }
            }
          })
          this.getListTeacher()
        })
    },
handleAvatarSuccess(res, file) {
  this.courseInfo.cover = res.data.url
},
beforeAvatarUpload(file) {
  const isJPG = file.type === 'image/jpeg'
  const isLt2M = file.size / 1024 / 1024 < 2
  if (!isJPG) {
    this.$message.error('上传头像图片只能是 JPG 格式!')
  }
  if (!isLt2M) {
    this.$message.error('上传头像图片大小不能超过 2MB!')
  }
  return isJPG && isLt2M
},
        subjectLevelOneChanged(value) {
    for (var i = 0; i < this.subjectOneList.length; i++) {
        var oneSubject = this.subjectOneList[i]
        if (value === this.getOneSubject.id) {
            this.subSubjectTwoList = oneSubject.children
            this.courseInfo.subjectId = ''
        }
    }
},
        getOneSubject(){
            subject.getSubjectList()
            .then(response =>{
                this.subjectOneList = response.data.list
            })
        },
        getListTeacher(){
            course.getListTeacher()
            .then(response =>{
                this.teacherList = response.data.items
            })
        },
        addCourse(){
          course.addCourseInfo(this.courseInfo)
            .then(response =>{
                 //提示信息
                this.$message({
              type: 'success',
              message: '删除成功!'
            });
            this.$router.push({path:'/course/chapter/'+response.data.courseId})}
        )}
        },
        updateCourse(){
          course.updateCourseInfo(this.courseInfo)
          .then(response =>{
            this.$message({
              type: 'success',
              message: '删除成功!'
            });
            this.$router.push({path:'/course/chapter/'+this.courseId})
          })
        },
        saveOrUpdate(){
        if(!this.courseInfo.id){
          this.addCourse()
        }else{
          this.updateCourse()
        }
            
    }
}
</script>
<style scoped>
.tinymce-container {
  line-height: 29px;
}
</style>